dom4j读写文件

package com.tao.dom4j;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class TestMain {

	public static void main(String[] args) {
		try {
			File file = new File("d:\\student.xml");
			if (file.exists()) {
				readXML(file);
			} else {
				createXML(file);
			}
			System.out.println("操作结束! ");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// 读XML
	@SuppressWarnings("unchecked")
	public static void readXML(File file) throws DocumentException {
		SAXReader reader = new SAXReader();
		Document document = reader.read(file);
		Element root = document.getRootElement();
		for (Iterator iter = root.elementIterator("student"); iter.hasNext();) {
			Element student = (Element) iter.next();
			String id = student.selectSingleNode("id").getText();
			String name = student.selectSingleNode("name").getText();
			String age = student.selectSingleNode("age").getText();
			System.out.println("id:" + id);
			System.out.println("name:" + name);
			System.out.println("age:" + age);
		}
	}

	// 写XML
	public static void createXML(File file) throws IOException {
		Document document = DocumentHelper.createDocument();
		Element root = document.addElement("root");
		Element student = root.addElement("student");
		student.addAttribute("id", "001");
		student.addElement("name").setText("TaoistWar");
		student.addElement("age").setText("21");
		OutputFormat format = OutputFormat.createPrettyPrint();
		XMLWriter writer = new XMLWriter(new FileWriter(file), format);
		writer.write(document);
		writer.flush();
		writer.close();
	}
}